Why is my phone taking screenshots of my snapchat conversations by itself?

[AC Question]

My phone will randomly take a screenshot of a conversation with a friend in my snapchat and the screenshot won't show up in my gallery.

 

[B. Diddy]

Welcome to Android Central! Which phone do you have? If it's a Samsung device, screenshots can be taken by swiping the palm over the screen--could this be happening inadvertently?

 

[rhcp16]

My Nexus 5 is doing the same thing!